
04/04/14, 06:14 PM
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Join Date: Oct 2011
Posts: 704
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Couple of points to ponder. A toilet does not need a vent. Now this many cause some of you to think, "this guy is an idiot", but it's a fact. I have plumbed a few dozen new homes lately, all under the strict review of the local code officials, and following the letter of the law of the IRC. The reason you don't provide an individual vent to a toilet in MOST cases is that it is discharging a fairly small amount of water and water, in the bottom of a fairly large pipe. Bottom line is that you are lucky to "fill" the bottom 1/4 of the pipe in the middle of a flush, leaving a lot of air on top, and no venting issues. Honestly, judging buy some of the amazingly horrendous plumbing I have repaired over the years, if you are dealing with properly sized plastic drain lines, not old cast iron, it's pretty tough to get them to clog. Next is the misunderstanding that "low flow" and poor performance are related. Sorry, but no. I typically install Mid-grade American Standard units available at any big box supplier. They are highly rated, and perform flawlessly. Finally, ideal pitch is 1/4 to the foot. !/8" can leave solids behind due to sluggish flow , and once you exceed 3/8" you can also have issues with solids laying in the pipe while the liquids quickly flow past. The code specifically states that 1/8" can be allowed at the discretion of the inspector.
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